CN112858480B - Mechanical axial excitation device and method for nondestructive testing of pipeline - Google Patents

Abstract

The invention relates to a mechanical axial excitation device and a method for nondestructive testing of a pipeline, and belongs to the technical field of pipeline testing.

Description

Mechanical axial excitation device and method for nondestructive testing of pipeline

Technical Field

The invention belongs to the technical field of pipeline detection, and particularly relates to a mechanical axial excitation device and method for nondestructive detection of a pipeline.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

An excitation detection method is generally adopted for crack detection of a pipeline in the prior art, namely when an excitation frequency is f ultrasonic waves in a test piece, if cracks exist in the test piece, sound waves propagating along the pipeline can be reflected and transmitted, and the size and the position of the cracks can be judged by utilizing a guided wave method theory and analyzing and calculating incident waves and reflected waves.

The inventor finds that: at present, the method of applying axial excitation to the pipeline is commonly used for sawing a section of the pipeline partially, then applying axial excitation to the sawed section, detecting cracks through corresponding detection equipment, and finally butting the pipeline together.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a mechanical axial excitation device for nondestructive testing of a pipeline, when crack detection is required to be carried out on the pipeline, the excitation device is arranged on the pipeline, then a radial force is applied to an intermediate ring in the device, the axial force can be converted into an axial force on the pipeline, finally, the crack can be detected through corresponding detection equipment, and the pipeline is not required to be damaged.

The embodiment of the invention provides a mechanical axial excitation device for nondestructive testing of a pipeline, which comprises a slip sleeved on the pipeline, wherein the slip is fixedly connected with the pipeline, one side of the slip on the pipeline is sequentially sleeved with a moving ring, an intermediate ring and a fixing ring, the diameters of the moving ring, the intermediate ring and the fixing ring are larger than the diameter of the pipeline, the fixing ring is fixed, the intermediate ring is respectively connected with the moving ring and the fixing ring through two force rods, the two force rods are respectively hinged with the moving ring, the intermediate ring and the fixing ring, the diameter of the outer wall surface of the intermediate ring can be changed after the radial force is borne, and the radial force can be transmitted to the slip through the two force rods and the moving ring so as to be converted into axial excitation of the pipeline.

Furthermore, the slips, the moving ring, the middle ring and the fixing ring are all formed by splicing multiple sections.

Further, the intermediate ring is formed by splicing a first half ring and a second half ring, and the first half ring is connected with the second half ring through a hinge mechanism.

Furthermore, the first half ring and the second half ring are connected with the moving ring and the fixing ring through the same number of two force rods.

Further, the hinge mechanism is arranged at the position where the first half ring and the second half ring are butted, and the hinge mechanism is detachable.

Further, the surface of the intermediate ring is provided with an excitation point, and a fixed point is arranged on the surface of the intermediate ring opposite to the excitation point, wherein the fixed point is in a fixed state.

Further, the two-force rod is a two-force rod.

Furthermore, the two force rods are distributed in a circumferential array by taking the circle center of the middle ring as the center.

The embodiment of the invention also provides a working method of the mechanical axial excitation device for the nondestructive testing of the pipeline, which is based on any one of the above methods, and the method comprises the following steps:

fixing the slips on the outer wall surface of the pipeline, and simultaneously sequentially sleeving a moving ring, an intermediate ring and a fixing ring on one side of the slips on the pipeline, wherein the intermediate ring is respectively hinged with a two-force rod between the moving ring and the fixing ring;

setting the fixing ring to be in a static state relative to the ground;

radial force is applied to the surface of the intermediate ring which, under radial force, reduces in diameter to collide with the slips through movement of the moving ring, thereby applying axial force to the pipe.

Further, the surface of the intermediate ring is provided with an excitation point, and the position of the intermediate ring corresponding to the excitation point is set to be in a state of being relatively static with the ground.

The invention has the following beneficial effects:

(1) The mechanical axial excitation device provided by the invention can be directly sleeved on the outer wall surface of the pipeline, after the diameter of the intermediate ring is reduced after the intermediate ring is applied with instant radial force, the slip and the pipeline can be applied with an axial force through the two force rods and the moving ring, the structure is simple, the pipeline does not need to be damaged, and the mechanical axial excitation device can be installed and used on the outer wall surface of the existing pipeline.

(2) The fixing ring in the mechanical axial excitation device is fixed and has a diameter larger than that of the pipeline, so that the axial excitation force can be transmitted along one direction of the pipeline.

(3) The middle ring, the moving ring and the fixing ring are connected through the two-force rod, the arrangement structure is simple, and most of force on the middle ring can be transmitted to the slips.

Drawings

Fig. 1 is a structural view of an overall installation of a mechanical axial excitation device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the connection between the middle ring and the front and rear positioning rings of the mechanical axial excitation device according to the embodiment of the present invention;

FIG. 3 is a block diagram of the mechanical axial activation assembly according to an embodiment of the present invention illustrating the connection of the front drive ring to the slips;

FIG. 4 is a block diagram of the end connection of a retaining ring in the mechanical axial excitation assembly as a whole according to an embodiment of the present invention;

fig. 5 is a block diagram of the connection of the rear positioning ring and the fixed ring in the whole mechanical axial excitation device according to the embodiment of the present invention.

In the figure: 1. slips, 2, a front moving ring, 21, an installation seat, 3, a middle supporting ring, 4, a rear positioning ring, 5, a fixing ring, 6, a connecting rod, 7, a hinge structure, 8 and an exciter.

Detailed Description

At present, the method for detecting the excitation of the pipeline is to locally break the pipeline and then apply excitation to the section of the pipeline, but the method is easy to damage the pipeline to a certain extent.

It should be noted that the excitation device provided by the embodiment of the present invention can be used for connecting an existing outdoor pipeline, and can be used for a pipeline buried under the ground.

In order to solve the above problems, as shown in fig. 1, in an embodiment of the present invention, a mechanical axial excitation device for nondestructive testing of a pipe is provided (assuming that the direction close to the slips is forward and the direction far away from the slips is backward) which mainly comprises slips 1 fitted around the pipe, and a front moving ring 2, a rear positioning ring 4 and a fixed ring 5 which are sequentially arranged on one side of the slips along the axis of the pipe, wherein the slips 1 are directly fixed to the outer wall surface of the pipe, an intermediate support ring 3 is arranged between the front moving ring 2 and the rear positioning ring 4, the diameter of the intermediate support ring 3 is changed, the diameters of the front moving ring, the intermediate support ring, the rear positioning ring and the intermediate support ring 3 are all larger than the diameter of the pipe to be tested, and the front moving ring can move along the center line of the pipe.

The middle support ring 3 is connected with the front moving ring 2 and the rear positioning ring 4 through a connecting rod, an excitation point is arranged on the surface of the support ring, force is applied to the excitation point through an exciter 8, the diameter of the support ring can be reduced and then is transmitted to a slip 1 fixed on a pipeline through the connecting rod and the front moving ring, so that axial force is transmitted to the pipeline, and then later-stage crack detection is carried out.

In the embodiment of the present invention, the fixing ring 5 is fixed, it is understood that the fixing ring 5 is stationary relative to the ground, or is directly fixed to the ground, or may be directly fixed to a fixed base, and the specific connection structure is not shown in this figure, so that it is ensured that the force can be mostly directly transmitted to the slip 1 through the forward moving ring. In other embodiments, however, the retaining ring may be omitted and the rear retaining ring may be used instead of or as an integral part of the retaining ring.

It should be noted that the slip 1 is mainly used for being fixed on the outer wall surface of the pipeline, and the specific structure thereof may adopt an existing slip structure, which is not described herein again, and specifically refer to a patent of an integral clip slip for a pipeline (publication No. CN104266033A), and only an articulated seat for connecting a connecting rod needs to be installed on the slip.

In order to realize that this device fixes on the pipeline, wherein slips 1, holding ring, middle support ring 3 and solid fixed ring 5 all form through the concatenation of multistage ring bodies, when needs detect the pipeline, can install on the pipeline between these ring bodies, after detecting and finishing, can directly pull down these ring bodies can, simple structure, simple to operate.

Referring to fig. 3 to 5, in the embodiment of the present invention, the front and rear positioning rings and the fixing ring are formed of two semicircular rings, which are connected at one end by a hinge mechanism and at the other end by a mounting seat 21, and the mounting seat 21 is provided with a bolt hole, when the two semicircular rings are mounted, the two semicircular rings are directly fitted over the pipeline and then connected by a bolt.

The hinge mechanism in the embodiment of the invention mainly comprises two rotating plates which are hinged together through a pin shaft, and the hinge mechanism is similar to a rotating mechanism between the existing door body and a wall, belongs to the existing mechanism, and can not be described in detail.

Further, as shown in fig. 1, in the present embodiment, an intermediate support ring 3 is disposed between the front moving ring 2 and the rear positioning ring 4, wherein the diameter of the intermediate support ring 3 is larger than the diameter of the front moving ring and the diameter of the rear positioning ring, respectively, and the diameter of the intermediate support ring is still larger than the diameter of the front moving ring and the diameter of the rear positioning ring after the intermediate support ring bears the radial force, so that the angle change of the connecting rod between them can be ensured to provide an axial force to the slip.

Wherein the both sides of middle support ring 3 are connected with preceding holding ring and back holding ring through the connecting rod respectively all be equipped with the pin joint on preceding holding ring and the back holding ring and on the middle support ring, connecting rod length direction's both ends all are articulated with holding ring and middle support ring, and when the diameter of middle support ring changed like this, the contained angle between connecting rod and the holding ring also can follow the change, drives preceding holding ring simultaneously and removes.

Preferably, the connecting rod 6 in this embodiment is a two-force rod, wherein the two-force rod is a rod balanced by only two forces, and the two forces applied to the two-force rod are the same in magnitude and opposite in direction, so that the force on the middle support ring 3 can be transmitted to the forward moving ring.

As a person skilled in the art will readily appreciate, the two-force rod in this embodiment may be replaced by another two-force member, but preferably, it is a two-force straight rod, because the overall structure is not only simple, but also can ensure that the force is transmitted along the axis of the rod without affecting the whole rod, and of course, it may be replaced by a bent rod, and both ends of the bent rod in the length direction are respectively hinged to the positioning ring and the intermediate ring, but the bent rod is selected to make the axial excitation device in this embodiment occupy a larger space.

In the embodiment of the invention, the two force rods are distributed in a circumferential array by taking the circle center of the middle support ring as the center, so that the force of the middle support ring can be uniformly transmitted to the front moving ring.

Preferably, the number of the two force rods distributed circumferentially in the embodiment is two, but in other embodiments, the number of the two force rods may also be more than two, but whatever the number, the two force rods need to be distributed circumferentially, so that the uniformity of force transmission can be ensured.

As shown in fig. 2, the middle support ring in this embodiment is formed by splicing two semicircular ring bodies, and a hinge structure is mainly disposed at a position where the two semicircular ring bodies are butted, and the two semicircular ring bodies are butted together by the hinge structure, where the hinge structure may adopt a hinge mechanism in a positioning ring, and the difference is that both ends of the two semicircular ring bodies on the middle support ring are connected by the hinge mechanism, and one section of the hinge mechanism may be detachable, for example, the pin shaft is detached to separate two hinge plates, so that it is ensured that the two semicircular rings can be butted and separated.

Further, as shown in fig. 2, in this embodiment, the hinge seats are disposed at the middle positions of the two half rings, so that the two-force rods at the two sides of the middle support ring can be directly connected to the hinge seats, and the hinge seats on the two half rings can be respectively used as an excitation point and a fixed point, as shown in fig. 1, the force applied to one excitation point by the exciter 8 can be driven to move the front moving ring by moving only one half ring because the other fixed point is fixed, so that the force can be transmitted to the slips.

It is of course also possible to use the upper hinge seats of both semi-rings as actuation points, so that both actuation points are simultaneously applied by both actuators and then force transmission takes place, but this is not as easy to operate as one actuation point is provided, since such simultaneous application of force on both sides requires a guarantee of simultaneity of time and force and is difficult to operate.

Moreover, it is easy to know that the hinge seat in this embodiment includes not only one seat disposed in the middle of the semicircular ring, but also a plurality of hinge seats may be disposed on the semicircular ring, so that two sides of one semicircular ring can be connected with a plurality of two-force rods, but it should be noted that it is ensured that one seat is disposed in the middle of the semicircular ring as an excitation point.

The following describes in detail the operation method of the mechanical axial excitation device for nondestructive testing of pipelines, which includes the following steps:

firstly, fixing a bearing bush on the outer wall surface of a pipeline, and sequentially sleeving a front moving ring, a middle supporting ring, a rear positioning ring and a fixing ring on one side of the bearing bush, wherein a two-force rod is hinged between the middle supporting ring and the positioning ring;

then, the fixing ring is set to be in a static state relative to the ground, for example, the fixing ring is directly fixed on the ground or fixed on a fixed base, and the rear positioning ring is fixed with the fixing ring;

and finally, applying radial force to the surface of the middle support ring, combining hinge mechanisms at two ends of the middle support ring under the condition of radial force so as to reduce the diameter of the middle support ring, and impacting the slips through the movement of the front moving ring so as to apply axial force to the pipeline.

The above-described embodiments of the present invention provide a method for applying axial excitation in the axial direction of a pipe without damaging the pipe.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (9)

1. The utility model provides a mechanical type axial excitation device for pipeline nondestructive test, a serial communication port, including the slips of suit on the pipeline, slips and pipeline fixed connection one side of slips is suit shift ring, intermediate ring and solid fixed ring in proper order on the pipeline, shift ring, intermediate ring and solid fixed ring's diameter are greater than the pipeline diameter, gu fixed ring is motionless, intermediate ring is connected with shift ring and solid fixed ring respectively through two power rods, two power rods respectively with shift ring, intermediate ring and solid fixed ring are articulated, the diameter of intermediate ring can diminish after bearing radial force in the outer wall of intermediate ring, and can transmit radial force for the slips through two power rods and shift ring, and then convert the axial excitation of pipeline.

2. The mechanical axial excitation device for nondestructive testing of a pipe of claim 1 wherein the slips, the moving ring, the intermediate ring, and the stationary ring are each formed from a plurality of segments joined together.

3. The mechanical axial excitation device for nondestructive testing of a pipe of claim 2 wherein the intermediate ring is formed by a first half ring and a second half ring joined by a hinge mechanism.

4. The mechanical axial excitation device for nondestructive testing of a pipeline of claim 3 wherein the first half ring and the second half ring are each connected to the moving ring and the stationary ring by the same number of two-force rods.

5. The mechanical axial excitation device for nondestructive testing of a pipeline of claim 3 wherein said hinge mechanism is removably disposed where said first and second halves abut.

6. The mechanical axial excitation device for nondestructive testing of a pipeline as set forth in claim 1 wherein a surface of said intermediate ring is provided with excitation points and a fixed point is provided on a surface of said intermediate ring opposite said excitation points.

7. The mechanical axial excitation device for the nondestructive testing of the pipeline as claimed in any one of claims 1 to 6 wherein said two-force rod is a straight rod.

8. The mechanical axial excitation device for the nondestructive testing of the pipeline as recited in any one of claims 1 to 6, wherein the two force rods are distributed in a circumferential array centered on the center of the center ring.

9. The working method of the mechanical axial excitation device for the nondestructive testing of the pipeline is characterized in that,

Fixing the slips on the outer wall surface of the pipeline, and simultaneously sequentially sleeving a moving ring, an intermediate ring and a fixing ring on one side of the slips on the pipeline, wherein the intermediate ring is respectively hinged with a two-force rod between the moving ring and the fixing ring;

setting the fixing ring to be in a static state relative to the ground;

radial force is applied to the surface of the intermediate ring which, under radial force, reduces in diameter to collide with the slips through movement of the moving ring, thereby applying axial force to the pipe.

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